The following rental housing units are exempt from the entire
RR&SIP:

Units unavailable for rent or outside the city limits;

Accommodations in hotels, motels, inns or similar facilities
for transient guests (except for units occupied by non-transient
guests);

Retirement or nursing homes and housing within any hospital or
State licensed medical care facility, service care facility, convent,
monastery or other housing occupied exclusively by members of a
religious order;

Mobile or manufactured homes (these fall within the
jurisdiction of Washington State Labor and Industries); and

Shelters for transitional housing.

The following rental housing units are required to register but
are exempt from paying the registration fee and from inspection:

Owner-occupied buildings containing two units

A single family residence that the owner occupies with an accessory dwelling unit that is rented out;

A single family residence with an accessory dwelling unit that the owners occupies;

A single family residence that has been converted into two apartments, one of which the owner occupies; or

A duplex in which the owner occupies one of the units.;

Units owned, operated or managed by a government agency or
authority or are specifically exempted from a fee by state or federal
law, however, once government ownership, operation or management ceases
so does the exemption for fee payment;

Rental units that receive funding or subsidies from federal,
state or local government, and that are inspected at least once every
three years as a condition of that funding; and

Accessory dwelling units that are attached to a single family
residential unit AND the owner of the property resides in either of
those housing units.

Do I need to register if I am renting out bedrooms in the
property I own and live in?

No, not as long as you are living at the property. If you ever move out
and rent out the entire property, you will be required to register.